Restrict prometheus_client >= 0.18.0 to prevent errors when importing pkgs (#3070)

requirements-neuron.txt

@@ -6,4 +6,4 @@ neuronx-cc
 fastapi
 uvicorn[standard]
 pydantic >= 2.0  # Required for OpenAI server.
-prometheus_client
+prometheus_client >= 0.18.0

requirements-rocm.txt

@@ -10,4 +10,4 @@ transformers >= 4.38.0  # Required for Gemma.
 fastapi
 uvicorn[standard]
 pydantic >= 2.0  # Required for OpenAI server.
-prometheus_client
+prometheus_client >= 0.18.0

requirements.txt

@@ -9,7 +9,7 @@ xformers == 0.0.23.post1  # Required for CUDA 12.1.
 fastapi
 uvicorn[standard]
 pydantic >= 2.0  # Required for OpenAI server.
-prometheus_client
+prometheus_client >= 0.18.0
 pynvml == 11.5.0
 triton >= 2.1.0
 cupy-cuda12x == 12.1.0  # Required for CUDA graphs. CUDA 11.8 users should install cupy-cuda11x instead.